Most HP Deskjet printers are compatible with the HP Jetdirect EX print servers. These print servers are external network interface devices that support parallel connections. Printers that are not compatible with the HP Jetdirect EX print servers are the HP Deskjet 710c, 712c, 720c, 820c, 1000c, 3300, 3400, 3500, 3600, 3700, and 3840 series printers. These printers are host-based, which means that they require a Windows computer with specific driver functionality to format and print data correctly. The HP Jetdirect print servers format print data independent of any computing system and, therefore, send print data without specific printer formatting.

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